A system and method of selecting a package model are disclosed. A data structure of a plurality of package models and one or more attribute relationships may be stored. Each package model may have a plurality of package model attributes including at least a size and a style. Each attribute relationship may include an indication that one or more supplemental attributes are required if a constraint is satisfied. A user input that is descriptive of a desired package capability may be received. Using a semantic reasoner, the user input may be analyzed to determine one or more desired attributes. The data structure may be accessed to automatically determine whether a desired attribute satisfies a constraint for an attribute relationship. The one or more supplemental attributes required by the attribute relationship may be presented.